What is ATRAC Advanced Lossless?

About ATRAC Advanced Lossless.

ATRAC Advanced Lossless is an audio compression technology that enables compression of audio signals without any loss of data. To maintain compatibility with previous devices, this technology was built with ATRAC3 and ATRAC3plus as a base, and is able to compress a CD anywhere from 30% to 80% of its original without any loss of data.